Method of making gas stove burners and core for same



April 18, 1944. c, BALQERZAK METHOD OF MAKING GAS STOVE BURNERS AND CORE FOR SAME Filed NOV. 15, 1941 2 Sheets-Sheet 1 INVENTOR. EDWARD C-BALCERZAK.

April 18, 1944. Q BALCERZAK 2,346,720

METHOD OF MAKING GAS 'STOVE BURNERS AND CORE FOR SAME Filed Nov. 15, 1941. 2 Sheets-Sheet 2 T 4 INVENTOR/ EDWARD QBALCERZAK w I I v v I Patented Apr. 18, 1944 METHOD OF MAKING GAS STOVE BURNERS AND CORE FOR SAME k Edward C. Balcerzak, Milwaukee, Wis., assignor to A. J. Lindemann & Hover-son Company,

Milwaukee, Wis., a corporation of Wisconsin Application November 15, 1941, Serial No. 419,306

12 Claims.

The improvementsrelate to gas burners and methods of making the same, more particularly burners for gas stoves, and include the production of a gas burner consisting of a one-piece casting with fuel inlet, interior bowl or distributing conduit and, numerous small open mouthed channels radiating therefrom and forming circumferential ports for supporting jet combustion. This burner is produced in a peculiar manner and by the employment oi cores formed and arranged to give the desired result with accuracy and certainty and at a minimum of labor and time. The resulting burner has all the efllciency and other advantages of hand bored or two-piece burners, will not clog in ordinary use, is stronger and more durable and costs less for materials, labor an factory overhead.

Heretofore it has been the practice to make gas burners oi the kind involved herein in two or more parts comprising the burner proper and the burner cap, or in one piece without jet supporting ports and to drill the ports in the burner after the casting was made. These practices still prevail, and are attended with great dim culties and result in unsatisfactory work and imperfect products, which must be discarded or will produce undesirable results in use. The work alone of-drilling numerous small bores very close to one another each in exactly the right direction and position has always been a source of great trouble, uncertainty and loss to manufacturers.

The present improvements do away with all these difiiculties and with the use of two-piece burners, made of expensive and at present often unobtainable materials, accurately gauged, matched and fitted, and provide instead a burner cast in one piece by one simple molding operation and having the gas inlet, distributing bowl and numerous small radiating orifices therein and in a completely finished state ready for use.

There are other objects and advantages which will appear to those familiar with the art and which need not be enumerated.

The improvements are illustrated in the accompanying drawings, and in which-,

.Fig. 1 is a vertical medial section of a cast burner and cores as they are positioned in the mold when the casting is poured, exemplifying the improvements;

Fig. 2 is a bottom plan of the core which forms in the casting the top or exit chamber of the annular bowl and the jet supporting ports;

Fig. 3 is a bottom plan of the core which forms the gas inlet and distributing bowl; and

Fig. 4 is a perspective top view or the finished burner casting.

The cast burner comprises the inlet tube 5 with flanges 2 having holes 2' by which it may be bolted to a gas mixing tube supplying mixed air and fuel gas to the burner, the bowl portion 3, the cap portion 4, the jet ports 5 and channel or grooves 6 surrounding them. Inside the burner casting are the inlet channel I, the annular bowl or distributing duct 3 and its exit duct 4' with numerous small radiating channels 5 terminating in the ports surrounded by and communicating with the groove or recess 6.

The cores comprise the inlet channel and bowl forming core 1,1 and the exit duct and port forming core 8, 8. The coreB, 8'. has an annular extending print 9 surrounding and extending beyond the radial port-forming members 8' and integral therewith, which also forms the groove 6 and provides for a smooth mouth for each port where it joins the said groove. This print reenforces the slender radiating members 8' of the core and prevents them. from breaking until the casting has set. The print 9 is cut away at It to allow draft at that point for the pattern. Chaplets are employed and located in proper positions, as at the points marked X, and also a suitable ridge ll engaging the groove H to support and hold the core members in proper position.

The burner shown in the drawings is an actual size commercial burner and the mold and core members are of size and proportions to produce such a burner. It will be seen that the port or gas exit channels 8 are between A; and 1 inch in diameter; that they are slightly flared at their inner ends (Fig. 2); that they are approximately x e inch in length and that the members 8 and 9 form therewith an integral core unit. It will also be noted that the portion 3 is much greater in cross-sectional area than the ports 8, so as to provide an annular distributing chamber of capacity sufiicient to supply all the ports with gaseous fuel and properly support the combustion jets at the recess 6. The relative size and proportions of these ports should be maintained in all normal sizes of cooking burners.

he cores are made of core sand in any suitable way, as in core boxes, and are baked, the core 8, 8' being sprayed or otherwise treated with a molasses water or other tempering substance before baking. They may also be faced. They are then assembled in 'the mold by first placin the core 8 8' in position in the bottom broken oil, the cores disintegrated and the casting cleaned in any usual manner, as in a tumble barrel.

The formation and shape of the mold is indicated in Fig. l, the pattern being a conventional match plate with the core prints a part thereof. As the procedure and mold referred to in this and the two preceding paragraphs are ordinary in the molding art they need not be described or shown in detail. Line l3 indicates the parting of the cope II and drag l and I2 shows the sprue of one of the gates while line l3 (Fig. 4) indicates the parting line of th mold on the casting. The flanges 2 are molded in the green sand with small hole cores for the holes 2'. Preferably four burners are cast simultaneously in a single mold, and they are molded in inverted position, as indicated in Fig. 1.

It will be noted that the ports 5 are angular in cross section and as shown are substantially rectangular. This is one of the characteristics ofthe present improvements, since angular channels cannot be bored, They are also slightly larger in area than the standard bored ports and are somewhat longer. The result of this is that the ports are less subject to clogging and are more easily cleaned it necessary, while the increased friction due to their extralength and angular form ensures against an over supply 'of gas for the jets and promotes perfect combustion.

The parts herein shown and described may be varied to change the shape and construction of the parts within the wide limits of the molding art, and those who practice the invention will find it quite possible to-do this, for example to change the cross section and length of the ports 5 or to make them tapering from end to end, without departing from the scope of the said invention.

I claim:

1. The method or process of producing a bumer formed of a single casting and comprising an inlet channel, a distributing chamber and numerous small passages and ports for gaseous fuel to support exterior combustion leading from said interior chamber to the outside thereof, which consists essentially in forming a core in a pluralityof parts of core sand or like friable material, one part forming an interior chamber in communication with a gaseous fuel inlet and another forming the exit portion of said chainber and numerous tenuous passages extending laterally therefrom to a circumferential combustion recess at the exterior of the burner each of the portions thereof which form the said exit portion and recess being larger and stronger than the portion which forms the passages, assembling said cores and positioning them in a mold and in spaced relation thereto so as to P oduce the molded outer walls of the burner and a thick top portion, with said numerous passages therein, then pouring the mold, opening the same, removing the casting therefrom and removing the cores inside said casting therefrom.

2. The method or process of producing a burner formed of a single casting and comprising an inlet channel, a distributing chamber and numerous small passages and parts for gaseous fuel to support exterior combustion leading from said interior chamber to the outside of the bumer, which consists essentially in forming a core in a plurality of parts of core sand or like friable material, one part forming an interior chamber in communication with a gaseous fuel inlet and another forming the exit portion of said chamber and numerous tenuous radiating passagesextending laterally therefrom to a circumferential combustion recess at the said exterior each of theportions thereof which form the said exit portion and recess being larger and stronger than the portion which forms the passages, assembling said cores and positioning them in spaced relation in a mold so as to produce the molded outer walls of the burner and a thick top portion with said numerous passages therein, then pouring the mold, opening the same, removing the casting therefrom and removing the cores inside said casting therefrom.

3. The method or process of producing a bumer formed of a single casting and comprising an inlet channel, a distributing chamber and numerous small passages and ports for gaseous the mold each of the portions thereof which form the said exit portion and combustion chamber being larger and stronger than the portion which forms the passages, assembling said cores and positioning them in spaced relation to a mold so as to produce the molded walls of the burner, then pouring the mold, removing the casting therefrom and disintegrating the cores inside said casting and removing fragments thereof through the openings.

4. The method or process of producing a burner in a casting operation comprising an inlet channel, a distributing chamber and numerous small passages and ports for gaseous fuel to support exterior combustion leading from said chamber to the outside of the burner, which consists essentially in forming a core in a plurality of parts of core sand or like friable material, one part forming an interior chamber in communication with a gaseous fuel inlet and another forming an external printand the exit portion of said chamber and numerous tenuous passages of angular cross section extending therefrom to the exterior of the burner and topering from end to end each of the portions thereof whichform the said print and exit portion being larger and stronger than the portion which forms the passages, assembling said cores in superposed position in an outer mold and positioning them in spaced relation thereto so as to produce the molded walls of the burner, then pouring the mold, removing the casting therefrom, disintegrating the cores and removing the fragments thereof.

5. The method or process of producing a burner casting comprising an inlet channel, an interior distributing chamber and numerous small passages and ports for gaseous fuel to supp rt exterior combustion leading from saiddnterior chamber to the outside thereof, which consists essentially in forming a core in a plurality of interengaging self-supporting parts of core sand or like friable material, one part forming an interior chamber in communication with a gaseous fuel' inlet and another forming an external print and the exit portion of said chamber and numerous tenuous passages extending laterally therefrom to the exterior of the bumer' each of the portions thereof which form the said print and exit portion being larger and stronger than the portion which forms the passages, assembling said cores and positioning them in spaced relation in a mold so as to produce the molded outer walls and cap of the burner, then pouring the mold, removing the casting therefrom and disintegrating the cores and removing th fragments thereof.

6. Acore of core sandv or like friable material throughout for forming the fuel distributing and jet combustion supporting channels and ports of a gas burner by molding the same in a single piece, comprising an annular inner portion, numerous separate, spaced, attenuated members integral therewith and radiating therefrom and a print portion surrounding the extremities of said radiating members and joined thereto to support and position the same in amold and to form a continuous channel surrounding the ports formed by the said members in the casting and in free communication therewith the said annular inner portion and print portion each being larger and stronger than the said attenuated members, the said portions and members forming a single rigid core member'and the said portions joining the ends of said members and reinforcing them and said members forming a connecting linkbetween the said portions.

7. The method or process of producing a burner in a single casting operation comprising the steps of providing a core member forming the fuel distributing and Jet combustion supporting channels and ports of the .burner, having an annular inner portion, numerous separate, uniformly spaced, attenuated members integral therewith and radiating therefrom and a print portion surrounding the extremities of said radiating members and joined thereto to form a continuous channel surrounding the ports formed by the said members in the casting and in free communication therewith, the said portions and members being composed of core sand or like friable material and forming a single rigid core member and the said portions being larger and stronger than and joining the ends of said members and reinforcing them, placing said core in a mold in spaced relation thereto and supported thereon by said print portion and in contact in communication with a fluid fuel inlet forming part, a part for, forming an exit portion of said chamber and a portion for forming said passages extending therefrom to the exterior of the burner and consisting of spaced and sepaas to produce the molded outer walls of the burner and walls separating said passages and ports, then pouring the mold, opening the same, removing the casting therefrom and removing the cores inside said casting therefrom. l

9. A core for forming the fuel distributing and jet combustion supporting channels and ports of a gas burner by molding the same in a single piece, comprising an annular inner portion, nu merous separate, spaced, attenuated members all of less than one-eighth inch maximum diameter integral therewith and radiating laterally therefrom, said annular portion having a cross-sectional area much greater than that of each attenuated member, a continuous annular print portion surrounding and integral with the extremities of said radiating members and extending outwardly therefrom to support the said core in a mold and to form a continuous channel surrounding the ports formed by the said attenuated members in the casting and in free communicating therewith, the said portions and attenuated members composedof core sand or like friable material and forming a single rigid selfsupporting and positioning core unit and the said portions being larger and stronger than and positioning and reinforcing the said attenuated members and said attenuated members forming connecting links between the said portions.

10. A core of core sand or like friable material for forming the fuel distributing and jet combustion supporting channels and ports of a gas i burner by molding the same in a single piece. comprising an annular inner portion, numerous separate, spaced, attenuated members all of less than one-eighth inch maximum diameter integral therewith and radiating laterally therefrom, said annular portion having a cross-sectional area much greater than that of each attenuated member and extending beyond their inner ends vertically, said attenuated members being flared at their inner ends to produce a flare in said channels, and a continuous annular Iprint portion surrounding and integral with the extremities of said radiating members and extending outwardly therefrom forming a support for said radiating member and to form a continuous channel surrounding the ports formedby the said attenuated members in the casting and in free communication therewith, thelsaid portions and attenuated members forming a single rigid selfsupporting core unit and the said portions being larger and stronger than and positioning and reinforcing the said attenuated members and said attenuated members forming connecting links between the said portions.

1. A sectional core of core sand or like friable material for forming the fuel receiving and distributing, the jet combustion supporting channels and the ports of ages burner by molding the thereof to support exterior combustion and leading from said interior chamber to the outside of the burner, which consists essentially in making a core of core sand or like friable material comprising an interior chamber forming portion same in a single piece, comprising a member for forming an inlet and a gas receiving chamber extending around the inside of the burner, an inner distributing chamber forming member extending from and in contact therewith, numerous separate, spaced, attenuated lateral members integral with the last named member and radiating laterally therefrom, a print portion surrounding the extremities of said radiating members and joined thereto to form a continuous channel surrounding the ports formed by the said radiating members in the casting and in free communication therewith, the said last three portions and members forming a single rigid core piece the said attenuated lateral members being smaller and weaker than the distributing chamber forming member and than the print portion supported in a flask by said print p rtion, the said print and inner portions reinforcing the said radiating members and the said radiating members forming a connecting link'between the said members.

12. A sectional core of core sand or like friable material for forming the fuel receiving and distributing, the jet combustion supporting channels and the ports of a ga burner by molding the same in a single piece, comprising a member for forming an inlet and a gas receiving chamber extending around the inside of the burner, an

inner distributing chamber forming member extending and in contact therewith, numerous separate, spaced, attenuated lateral members integral with the last named member and radiating laterally therefrom, a print portion surrounding the extremities of said radiating members and joined thereto to form a continuous channel surrounding the ports formed by the said, radiating members in the casting and in free communi cation therewith, the said last three portions and members forming a single rigid core piece supported in a flask by said print portion. the said print and inner portions being larger and strong- -er than and reinforcing the said radiating members and the said radiatingmembers iorming a connecting link betweenthe said members, there being an interlocking severable connection between said first named member and the inner portion on at least three sides of the core for holding the said parts in their proper relative positions while a mold is being poured.

EDWARD c. BAr'icEnzAK. 

